28 MR. W. F. LANCHESTEB ON THE [Jail. 17, 



instead of at the anterior border of the middle third ; in conse- 

 quence of which the kidneys do not nearly reach to these origins. 

 The individual from Pasir Panjang was, in life, coloured orange, 

 with the tip of the tail black. 



5. Phascolosoma pellucidum Keferstein. 



Selenka, torn. cit. p. 32. 



Loc. Singapore. Pasir Panjang ; one specimen. 



Malacca. Pulau Jawi ; two specimens, from under deep stones. 



Selenka says in regard to the kidneys in this species : " Segmen- 

 talorgane von halber Korperliinge." Keferstein, on the other 

 hand, says : " Segmentalorgane kurz " ; and his figure accoi-ds 

 with this description. These specimens agree with Keferstein's 

 description in this respect ; the kidneys are only one-sixth of 

 the length of the body in the individual from Singapore, a little 

 more than one-sixth in those from Malacca. 



There are no hooks on the introvert in any of these examples, 

 and in those from Malacca the retractors are notably thicker than 

 in the Singapore specimen. 



On the tails of these individuals {i. e. fi'om both localities) is 

 fixed a species of the Entoproctous Polyzoan Loxosoma, which 

 Dr. Harmer has kindly undertaken to examine. 



III. Genus Physcosoma. 



6. Physcosoma scolops Sel. & de Man. 



Selenka, torn. cit. p. 75. 



Loc. Singapore. Raffles Lighthouse ; two specimens. S'alat 

 Sinki (strait between Pulau Brani and Blakang Mati), 5 fathoms, 

 bottom of mud and stones ; one small specimen. 



In one example, the largest, the introvert is even longer than 

 the body, being 1 ^ times the length of the latter. As regards 

 the longitudinal muscle-bands, there are only 17-19, instead of 

 20-21 ; the retractors, moreover, do not fuse till very far forward 

 in the introvert. 



5. The Marine Fauna of Zanzibar and British East Africa, 

 from Collections made by Cyril Crossland in the Years 

 1901 and 1902. — Gephyrea. By W. F. Lanchester, 

 M.A., Assistant Lecturer and Demonstrator in Zoolo^ 

 in University College, Dundee *, 



[Received November 1, 1904.] 



(Plate I.t) 



This collection was made by Mr. Crossland in East Africa during 

 the years 1901-1902; it includes in all examples of 20 species, 



* Communicated by the Seceetaet. 

 t For explanation of the Plate, see p. 35. 



